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CVE-2019-16215

6.5 · MEDIUM

The Markdown parser in Zulip server before 2.0.5 used a regular expression vulnerable to exponential backtracking.

Published Sep 18, 2019CWE-1333EPSS 1.25%

Overview

CVE-2019-16215 is a medium-severity vulnerability. It was published on September 18, 2019 and has a CVSS 3.1 base score of 6.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 6.5, rated MEDIUM. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical description

The Markdown parser in Zulip server before 2.0.5 used a regular expression vulnerable to exponential backtracking. A user who is logged into the server could send a crafted message causing the server to spend an effectively arbitrary amount of CPU time and stall the processing of future messages.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refblog.zulip.org/2019/09/11/zulip-server-2-0-5-security-release/GitHubgithub.com/zulip/zulip/commit/5797f013b3be450c146a4141514bda525f2f1b51Refblog.zulip.org/2019/09/11/zulip-server-2-0-5-security-release/GitHubgithub.com/zulip/zulip/commit/5797f013b3be450c146a4141514bda525f2f1b51

How CyberStrike helps

Frequently asked questions

What is CVE-2019-16215?

CVE-2019-16215 is a medium-severity vulnerability. It was published on September 18, 2019 and has a CVSS 3.1 base score of 6.5 (MEDIUM).

How severe is CVE-2019-16215?

This vulnerability has a CVSS 3.1 base score of 6.5, rated MEDIUM. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2019-16215?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2019-16215?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2019-16215 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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